Sleep surface



FIG. 1 is a perspective view of a sleep surface showing my new design;

FIG. 2 is an end view of FIG. 1;

FIG. 3 is a top plan view of FIG. 1;

FIG. 4 is a side view of the sleep surface, the opposite side is a mirror image thereto; and,

FIG. 5 is a bottom plan view of FIG. 1. 

The ornamental design for a sleep surface, as shown and described. 